Book Maths Puzzle Numerical Ability

there are two identical metal sheets first one is melted and converted into maximum possible spheres of equal radius 'r' cm. and 14 cubic cm metal was left .second one is melted and converted into maximum possible sphere of equal radius 2r cm and then 36 cubic cm of metal was left. if volume of each is integer find the volume of each bigger sphere?

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Book Other Question
The income of a company increases 20% pa. If its income is 2664000/- in the year 1999. What was its income in the year 1997? A Train 150 meters long passes a mile store in 15 sec and another train of same length travelling in opposite direction in 8 sec. what is thw speed of the second train?